Inverter Half Bridge Dead Time Control via Temperature Feedback
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Solution Overview
Problem
In electric machine drive systems, existing inverter technologies face challenges in setting an optimal dead time between switching elements to prevent short circuits and overheating, which affects energy transfer efficiency and semiconductor heating.
Innovation Solution
A method and device that dynamically adjust the dead time by reducing it relative to previous cycles based on temperature measurements, using a control device and temperature ascertainment device to determine a critical dead time that balances efficiency with thermal safety, allowing for continuous adjustment and compensation for aging effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dead time is reduced to improve energy transfer efficiency, then the power yield increases, but the risk of short circuit and semiconductor heating increases
Solution Approach 1:
The patent implements dynamic dead time adjustment where the dead time parameter is no longer fixed but varies continuously based on operating conditions such as temperature, switching frequency, and load characteristics. The control device automatically adapts the dead time for each switching cycle, allowing optimal energy transfer while preventing short circuits and overheating through real-time parameter modification.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor temperature, switching behavior, and electrical parameters to continuously adjust the dead time. The control device uses measured data from previous switching cycles to optimize the dead time for subsequent cycles, creating a closed-loop control system that balances efficiency and safety.
2Productivity
If the dead time is reduced to maximize power yield, then the operational efficiency improves, but the thermal effects on switching elements increase
Solution Approach 1:
Temperature sensors and thermal monitoring systems provide feedback to the control device, which adjusts the dead time based on detected temperature levels. When temperatures approach critical thresholds, the system automatically increases the dead time to allow adequate cooling, preventing thermal damage while minimizing the impact on power yield through intelligent, condition-based adjustment.
Solution Approach 2:
The system dynamically changes the dead time parameter in response to thermal conditions, switching between different dead time values based on temperature, switching frequency, and load characteristics. This parameter adaptation allows the system to operate at optimal efficiency under favorable conditions while preventing thermal damage when temperatures rise.
3Device complexity
If a fixed dead time is used to simplify control, then the device complexity is reduced, but the adaptability to different operating conditions deteriorates
Solution Approach 1:
The control device performs self-adjustment of the dead time parameter based on monitored operating conditions without requiring external intervention or complex manual configuration. The system automatically adapts to different loads, temperatures, and switching frequencies, making the control process autonomous and reducing the need for complex external control mechanisms.
Solution Approach 2:
The system transitions from static, fixed dead time control to dynamic, adaptive control that automatically responds to changing operating conditions. This dynamic approach maintains simplicity in the control architecture while significantly improving adaptability through real-time parameter adjustment based on temperature, load, and switching frequency.
Data Source
AI summary
The invention relates to a method for setting a dead time between the opening of a first switching element (31) of a half bridge (2) and the closing of a second switching element (32) of the half bridge (2), comprising the steps: reducing the dead time of a switching cycle relative to the dead time of a preceding switching cycle, and determining a temperature of at least one of the switching elements (31, 32); wherein the steps of reducing the dead time and of determining the temperature are repeated for subsequent switching cycles until a critical dead time is reached, in the case of which a termination condition, which depends on the determined temperature, is fulfilled; and wherein the dead time is set using the critical dead time.